CN100525269C - Base band unit ring cascade resource back-up method and base band unit - Google Patents
Base band unit ring cascade resource back-up method and base band unit Download PDFInfo
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- CN100525269C CN100525269C CNB2006101092627A CN200610109262A CN100525269C CN 100525269 C CN100525269 C CN 100525269C CN B2006101092627 A CNB2006101092627 A CN B2006101092627A CN 200610109262 A CN200610109262 A CN 200610109262A CN 100525269 C CN100525269 C CN 100525269C
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Abstract
A method for backing up resource of baseband-unit ring cascade includes only carrying out master-backup sub link selection for each route service data using local BBU as destination BBU and being transmitted from master link and backup link simultaneously by each BBU in resource backup system of ring cascade in order to realize independent switching for transmission of each route service data and furthermore for realizing independent resource backup of transmission of said route service data by resource backup system.
Description
Technical field
The present invention relates to station technology, particularly the resource backup method and the Base Band Unit of the cascade of Base Band Unit annular.
Background technology
The base station is a part important in the mobile communications network, (UserEquipment is UE) and between the net control device, by the transmitting/receiving wireless signal to be connected in subscriber equipment, make the user terminal access of radio network, and the information interaction between realization and the network controller.Wherein, distributed base station since its have that volume is little, operation cost is low, easily realize characteristics such as dilatation, be applied in the mobile communications network just more and more widely.Wherein, the third generation (3rd Generation, 3G) net control device in the mobile communication system be radio network controller (Radio Network Controller, RNC); The second generation (2ndGeneration, 2G) net control device in the mobile communication system be base station controller (Base StationController, BSC).
Fig. 1 is the structural representation of distributed base station in the prior art.As shown in Figure 1, distributed base station by Base Band Unit (Base Band Unit, BBU) 101 and radio frequency unit (Radio Frequency Unit, RFU) 102 form, and are connected by radio frequency interface.Radio frequency unit 102 is divided into near-end radio frequency unit (near-end RFU) 121 and remote radio unit (Radio Frequency Remote Unit, RRU) 122.
In actual applications,, therefore often need, a plurality of BBU cascades are used by the dilatation interface because the disposal ability of single BBU is limited and can not realize the resource backup, thus the disposal ability of raising system.Wherein each BBU all can connect RFU, and it is master control BBU that a BBU can only be arranged.Fig. 2 is the structural representation of BBU chain cascade in the prior art.
Yet when the link between any therein two BBU of BBU chain cascaded system as shown in Figure 2 broke down, link will disconnect, and cause part BBU resource unavailable, thereby this system did not possess the resource backup functionality.
For when improving system processing power, can also make system have the resource backup capabilities, such a solution is arranged: change the chain cascade system between a plurality of BBU into annular cascade system in the prior art.
Fig. 3 is the resource standby system structural representation of BBU annular cascade in the prior art.The resource standby system of BBU annular cascade as shown in Figure 3 can only have a master control BBU in the system, all BBU all can be used as source BBU and send data to annular link, also can be used as the data of purpose BBU reception from annular link.Source BBU in the system simultaneously with business datum according to both direction A and B shown in Figure 3, mail to purpose BBU, thereby formed two transmission links, the transmission link of A direction is an active link; The transmission link of B direction is a reserve link, and purpose BBU judges that by the dilatation interface that receives business datum business datum is from A direction or B direction.
Fig. 4 is the flow chart of the resource backup method of BBU annular cascade in the prior art.As shown in Figure 4, the resource backup method of BBU annular cascade may further comprise the steps:
This method is when the transmission state of active link is unusual, purpose BBU stops from active link, it is the dilatation interface of A direction correspondence, receive business datum, comprise from source BBU sending to the data of this purpose BBU and being forwarded to the business datum of other BBU, all can't pass through, thereby cut off the primary link of full annular link from this purpose BBU by this purpose BBU, every other business datum all by the reserve link transmission, has realized the active and standby switching of all transmission links in the system.
Yet, though this method of prior art has realized the backup of resource, no matter but only whether the state of other transfer of data is unusual because one tunnel business data transmission is unusual, just all business data transmission links are all carried out active and standby switching, influenced the normal business data transmission of other states, operate as normal to system has caused impact, has also wasted the resource backup of system simultaneously.
Summary of the invention
In view of this, a main purpose of the present invention is: the resource backup method that the cascade of a kind of Base Band Unit annular is provided, this method can be carried out active and standby switching by a business data transmission link to abnormal state, and the active and standby switching of reduction system is to the influence of business transmission.
Another main purpose of the present invention is: a kind of Base Band Unit is provided, and this Base Band Unit can carry out active and standby switching by a business data transmission link to abnormal state, and the active and standby switching of reduction system is to the influence of business transmission.
According to first above-mentioned purpose, the invention provides the resource backup method of a kind of Base Band Unit BBU annular cascade, for the business datum from each source BBU in the system is provided with a main sublink and the standby sublink used, may further comprise the steps:
Each BBU in the resource standby system of A, BBU annular cascade is by the business datum of its dilatation interface reception from other BBU in the system;
B, BBU judge that whether the business datum receive is is purpose BBU with this BBU, if, execution in step C then;
C, to described main transmission quality with the business datum on sublink and the standby sublink, detect respectively, and judge whether that according to testing result needs switch, if desired, then carry out active and standby switching, to send to outside net control device by transmission unit from the business datum that standby sublink receives, perhaps send to external radio frequency unit R FU by the radio frequency interface unit.
Described step B further comprises: if the business datum that receives is not to be purpose BBU with this BBU, then transmits this business datum, and return steps A, continue to receive business datum.
Described step C further comprises: if do not need to switch, then will send to outside net control device by transmission unit from the main business datum that receives with sublink, and perhaps send to external RF U by the radio frequency interface unit.
Further comprise after the described step C: return steps A, continue to receive business datum.
Describedly with sublink and a standby sublink be for a master being set from the business datum of each source BBU in the system:
Will be from clockwise or counter clockwise direction, from the business datum of source BBU, logically Dui Ying transmission link is set to the main sublink of using of described business datum; Will be with main opposite with the sublink direction, from the business datum of same source BBU, logically Dui Ying transmission link is set to standby sublink.
Whether the business datum that the described judgement of step B receives is to be that purpose BBU is with this BBU: described BBU is according to the destination address of business datum, judges that whether the business datum that receives is is purpose BBU with this BBU.
Described step C is:
C1, described BBU are respectively to carrying out verification from the main business datum that receives with sublink and standby sublink;
C2, described BBU carry out error statistics to main with the check results of sublink and standby sublink respectively;
C3, described BBU will lead respectively with the error statistics result of sublink and standby sublink and predefined threshold value and compare, if main error statistics result with sublink has surpassed threshold value, it is unusual then to judge main transmission state with sublink, to send to outside net control device by transmission unit from the business datum that standby sublink receives, perhaps send to external RF U by the radio frequency interface unit.
Step C1 is described to be verified as: carry out the cyclic redundancy check (CRC) verification, perhaps carry out even parity check.
Described net control device is a radio network controller, perhaps is base station controller.
According to another above-mentioned purpose, the invention provides a kind of Base Band Unit BBU, be arranged in annular cascaded system, comprise main control unit, transmission unit and baseband processing unit, the business datum of described Base Band Unit is provided with main with sublink and standby sublink, and this Base Band Unit also comprises:
The interface processing unit comprises connecting described main two interfaces with sublink and standby sublink, is used to receive the business datum from external radio frequency unit R FU and outside BBU; To being that the transmission quality of the described main business datum with sublink and standby sublink of purpose BBU detects with this BBU, and, will send to transmission unit or outside RFU with sublink or from the business datum that standby sublink receives from described master according to testing result; With being not the business datum of purpose BBU, send to outside BBU with this BBU.
Described interface is handled unit pack and is drawn together: base band radio frequency interface, dilatation interface, data allocations unit, change detection unit and link switchover unit, wherein,
The base band radio frequency interface is used under the control of main control unit, will send to the external RF U that is connected with this BBU from the business datum of link switchover unit;
The dilatation interface comprises main two interfaces with sublink and standby sublink of connection, is used under the control of main control unit, receives main using on sublink and the standby sublink, from the business datum of outside BBU, and sends the data to the data allocations unit; To use sublink and standby sublink by the master from the business datum of data allocations unit, be transmitted to outside BBU;
The data allocations unit is used under the control of main control unit, receives the business datum from the dilatation interface, and according to the destination address of business datum, judges that whether described business datum is is purpose BBU with this BBU; With and be purpose BBU with this BBU, main with the business datum on sublink and the standby sublink, send to change detection unit and link switchover unit; Will be from the dilatation interface, and be not purpose BBU with this BBU, main with the business datum on sublink and the standby sublink, send to the dilatation interface;
The change detection unit is used under the control of main control unit, carries out change detection according to the business datum from the data allocations unit, and generates switch-over control signal according to testing result; Switch-over control signal is sent to main control unit;
The link switchover unit is used under the control of main control unit, receives from the data allocations unit, and is main with the data on sublink and the standby sublink; Reception when described switch-over control signal is invalid, sends to transmission unit or base band radio frequency interface with main with the business datum on the sublink from the switch-over control signal of main control unit; When described switch-over control signal is effective, the business datum on the standby sublink is sent to transmission unit or base band radio frequency interface;
Described main control unit is used for all unit of BBU are controlled; Reception is from the switch-over control signal of change detection unit, and described switch-over control signal is sent to the link switchover unit.
Described base band radio frequency interface further receives the business datum from the external RF U that is connected with this BBU, and this business datum is sent to the data allocations unit;
Described data allocations unit further will send to baseband processing unit from the business datum of base band radio frequency interface; And receive from baseband processing unit, and be not the business datum of purpose BBU with this BBU, and these data are sent to the dilatation interface.
Described baseband processing unit comprises: up processing unit and downlink processing unit, wherein
Up processing unit is used under the control of main control unit, will carry out Base-Band Processing from the uplink business data of data allocations unit, and after will handling, and is not that the uplink business data of purpose BBU sends to the data allocations unit with this BBU; To be that the uplink business data of purpose BBU sends to transmission unit with this BBU after handling;
The downlink processing unit is used under the control of main control unit, will carry out Base-Band Processing from the downlink service data of transmission unit, and the downlink service data after will handling sends to the data allocations unit;
Described data allocations unit further will be from the downlink processing unit, and is that the downlink service data of purpose BBU sends to the base band radio frequency interface with this BBU;
Described base band radio frequency interface further will send to the external RF U that is connected with this BBU from the downlink service data of data allocations unit.
Described change detection unit comprises: active link verification module and reserve link verification module, active link check results statistical module and reserve link check results statistical module, active link thresholding comparison module and reserve link thresholding comparison module and switching signal module, wherein
Active link verification module and reserve link verification module, be used for respectively carrying out verification, and check results is sent to active link check results statistical module and reserve link check results statistical module respectively from main data with sublink and the reception of standby sublink;
Active link check results statistical module and reserve link check results statistical module, be respectively applied for statistics from the mistake in the check results of active link verification module and reserve link verification module, and statistics is sent to active link thresholding comparison module and reserve link thresholding comparison module respectively;
Active link thresholding comparison module and reserve link thresholding comparison module, the statistics and the predefined threshold value that are respectively applied in the future independently with link check results statistical module and reserve link check results statistical module compare, and will send to the switching signal module greater than the result of thresholding with smaller or equal to the result of thresholding;
The switching signal module, be used for according to from active link thresholding comparison module greater than the thresholding result with from the result smaller or equal to thresholding of reserve link thresholding comparison module, produce effective switch-over control signal; According to from active link thresholding comparison module smaller or equal to the thresholding result, produce invalid switch-over control signal; Switch-over control signal is sent to the main control unit of BBU.：
As seen from the above technical solution, the resource backup method of BBU among the present invention and the cascade of BBU annular, make full use of the characteristics of BBU annular cascade and the advantage of the high bandwidth between the cascade BBU, by each BBU in the resource standby system of annular cascade, only to transmitting simultaneously with sublink and standby sublink from main, and be that each road business datum of purpose BBU is carried out the selection of active and standby sublink with this BBU, realization is switched separately the transmission of each road business datum, thereby make the resource standby system realize single resource backup to this road business data transmission, substituted the way of cutting off link in the prior art, and then do not influence the normal business data transmission of other states, reduced because the resource backup of system has also further been saved in the impact that active and standby switching causes system's operate as normal.
Description of drawings
Fig. 1 is the structural representation of distributed base station in the prior art;
Fig. 2 is the structural representation of BBU chain cascade in the prior art;
Fig. 3 is the resource standby system structural representation of BBU annular cascade in the prior art;
Fig. 4 is the flow chart of the resource backup method of BBU annular cascade in the prior art;
Fig. 5 is the exemplary process diagram of the resource backup method of BBU annular of the present invention cascade;
Fig. 6 is the internal structure schematic diagram of BBU among the present invention;
Fig. 7 is the change detection cellular construction schematic diagram of BBU among the present invention;
The resource standby system structural representation that Fig. 8 connects for BBU annular among the present invention;
Fig. 9 is the flow chart of the resource backup method 1 of BBU annular cascade among the present invention;
Figure 10 is the flow chart of the resource backup method 2 of BBU annular cascade among the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Basic thought of the present invention is: make full use of the characteristics of BBU annular cascade and the advantage of the high bandwidth between the cascade BBU, each BBU in the resource standby system of annular cascade, to being that the business data transmission of purpose BBU is carried out the independent detection of transmission quality with this BBU, and switch separately according to switch-over control signal, make the resource standby system of annular cascade to carry out independent switching, thereby realized single resource backup each road business datum to the transmission of each road business datum.
The present invention is provided with a main sublink and the standby sublink used for the business datum from each source BBU in the system.Wherein, the master is that each source BBU is from clockwise direction or counter clockwise direction, to the logically pairing transmission link of business datum of purpose BBU transmission in the system with sublink; Standby sublink then is, in the system each source BBU from main with the opposite direction of sublink, the logically pairing transmission link of business datum that sends to same purpose BBU.
Fig. 5 is the exemplary process diagram of the resource backup method of BBU annular of the present invention cascade.As shown in Figure 5, the resource backup method of BBU annular of the present invention cascade may further comprise the steps:
Step 503 is transmitted this business datum, and returns step 501, continues to receive business datum;
Step 504 detects the transmission quality of this business datum of independently using sublink and standby sublink, and judges whether that according to testing result needs switch, and if desired, then execution in step 505; If do not need, then selecting from the main business datum that receives with sublink is business datum to be sent, and execution in step 506;
Step 505 is carried out active and standby switching, and the business datum of selecting to receive from standby sublink is a business datum to be sent;
Step 506 sends to outside net control device with business datum to be sent by transmission unit, perhaps sends to external RF U by the radio frequency interface unit, and returns step 501, continues to receive business datum.
BBU can have a plurality of dilatation interfaces that are used for other BBU cascades, and each BBU in the annular cascade system is all by two dilatation interfaces and other two BBU cascades.Receive the dilatation interface of business datum and the source BBU information in the business datum by judgement, BBU can judge the main with sublink and standby sublink of business datum correspondence.BBU is by the destination address in the business datum, judges that whether this business datum is is purpose BBU with this BBU.
Said method still receives business datum from main with sublink and standby sublink simultaneously after carrying out active and standby switching, guaranteed that with other BBU be the influence that the business data transmission of purpose BBU is not switched.
All BBU in the resource standby system of BBU annular cascade all switch according to the method described above, can realize that the resource standby system carries out independent resource backup to the transmission of each road business datum.
Below, earlier the BBU that realizes said method is elaborated.
Fig. 6 is the internal structure schematic diagram of BBU among the present invention.As shown in Figure 6, BBU comprises: main control unit 601, transmission unit 602, baseband processing unit 603 and interface processing unit 604.
As shown in Figure 6, transmission line 61 is transmitted the circuit of business datum for BBU, destination address when data allocations unit 643 according to business datum, judge the business datum that receives by dilatation interface 642, when being not purpose BBU with this BBU, this road business datum is sent by next BBU in the system of dilatation interface 642 in link, realized forwarding business datum, and the business datum that has guaranteed the to transmit influence of not switched.Destination address when data allocations unit 643 according to business datum, judge the business datum that receives by dilatation interface 642, when being the business datum of purpose BBU with this BBU, this road business datum is sent to link switchover unit 645 by transmission line 62, according to realizing active and standby switching from the switch-over control signal of main control unit 601, and, send uplink business datas by transmission unit 602 by base band radio frequency interface 641 transmission downlink service datas; Simultaneously, this road business datum is sent to change detection unit 644 by transmission line 63, detect by 644 pairs of the quality in change detection unit from the business datum of active and standby two links, and, switch-over control signal is sent to link switchover unit 645 by main control unit 601 according to testing result generation switch-over control signal.
The function of each unit is as follows among the BBU of the present invention:
Specifically, baseband processing unit 603 comprises: downlink processing unit 631 and up processing unit 632.
Wherein, downlink processing unit 631, be used under the control of main control unit 601, will carry out modulation treatment such as chnnel coding and channel spread from the downlink service data of transmission unit 602, and the downlink service data after will handling send to data allocations unit 643;
Up processing unit 632, be used under the control of main control unit 601, to separate from the uplink business data of data allocations unit 643 and be in harmonious proportion processing such as decoding grade, and after will handling, be not that the uplink business data of purpose BBU sends to data allocations unit 643 with this BBU; With after handling, be that the uplink business data of purpose BBU sends to transmission unit 602 with this BBU.
The interface processing unit is connected with standby sublink with sublink with main, is used to receive the business datum from external RF U and other BBU; According to the destination address of business datum, judge that whether the business datum receive is is purpose BBU with this BBU; To be that the transmission quality of the business datum of purpose BBU detects with this BBU, and, will send to transmission unit 602 or outside RFU with sublink or from the business datum that standby sublink receives from main according to testing result; To be other BBU that the business datum of purpose BBU sends to the system outside with other BBU.
Specifically, interface processing unit 604 comprises: base band radio frequency interface 641, dilatation interface 642, data allocations unit 643, change detection unit 644 and link switchover unit 645.
Base band radio frequency interface 641 is used under the control of main control unit 601, receives the uplink business data from the external RF U that is connected with this BBU, and this uplink business data is sent to data allocations unit 643; To send to the external RF U that is connected with this BBU from the downlink service data of data allocations unit 643 and link switchover unit 645;
In the present embodiment, dilatation interface 642 can be for a plurality of; Data allocations unit 643 is according to the dilatation interface 642 that receives business datum, judges that business datum independently uses sublink, still is from standby sublink.
Main detection and active and standby switching with sublink and standby sublink transmission state realized in the data allocations unit 643 of interface processing unit 604, change detection unit 644 and link switchover unit 645.The change detection unit is by carrying out verification to main with the data on sublink and the standby sublink simultaneously, and will compare the error statistics result of check results and the threshold value that sets in advance and realize detecting.
Fig. 7 is the change detection cellular construction schematic diagram of BBU among the present invention.As shown in Figure 7, the change detection unit comprises: active link verification module 711 and reserve link verification module 721, active link check results statistical module 712 and reserve link check results statistical module 722, active link thresholding comparison module 713 and reserve link thresholding comparison module 723 and switching signal module 700.
Active link verification module 711 and reserve link verification module 721, be respectively applied for carrying out verification, and check results is sent to active link check results statistical module 712 and reserve link check results statistical module 722 respectively from main data with sublink and the reception of standby sublink.
Active link check results statistical module 712 and reserve link check results statistical module 722, be respectively applied for statistics from the mistake in the check results of active link verification module 711 and reserve link verification module 721, and statistics is sent to active link thresholding comparison module 713 and reserve link thresholding comparison module 723 respectively.
Active link thresholding comparison module 713 and reserve link thresholding comparison module 723, the statistics and the predefined threshold value that are respectively applied in the future independently with link check results statistical module 712 and reserve link check results statistical module 722 compare, and will send to switching signal module 700 greater than the result of thresholding with smaller or equal to the result of thresholding.
As shown in Figure 7, purpose BBU detects respectively the transmission quality of all business datums of current reception, the master represents with the thresholding comparative result of sublink and standby sublink whether the transmission state of link is normal, is normal smaller or equal to threshold value, is unusual greater than threshold value.If main normal with the unusual and standby sublink of sublink, then switching signal module 700 produces effective switch-over control signal, and sends to the main control unit 601 of this BBU, thereby has realized the active and standby switching of this link.
Change detection unit among the present invention also can not comprise active link thresholding comparison module 713 and reserve link thresholding comparison module 723, and the statistics that will be led respectively with sublink and standby sublink by active link check results statistical module 712 and reserve link check results statistical module 722 sends to switching signal module 700; Switching signal module 700, then being used for the autonomous in the future main statistics with sublink and standby sublink with link check results statistical module 712 and reserve link check results statistical module 722 compares, and according to the main sublink statistics of using greater than standby sublink statistics, produce effective switch-over control signal, according to greater than main standby sublink statistics, produce invalid switch-over control signal with the sublink statistics; Effective switch-over control signal or invalid switch-over control signal are sent to the main control unit 601 of BBU.
The annular cascade resource standby system that constitutes by above-mentioned BBU, concerning purpose BBU, not only service transmission link is divided into active link and reserve link, also the business datum that sends according to the not homology BBU in the system logically is divided into a plurality of sublinks with transmission link again.
The resource standby system structural representation that Fig. 8 connects for BBU annular among the present invention.As shown in Figure 8, concerning any one as the BBU of purpose BBU, n BBU arranged as source BBU in the system, simultaneously to this purpose BBU transmit traffic data, logically form the main standby sublink of n clockwise direction (A direction) with sublink and n counter clockwise direction (B direction), purpose BBU only carries out active and standby switching to the sublink of business data transmission abnormal state, and do not cut off whole link, neither influence the business data transmission of other sublinks, also do not influence the business datum that this purpose BBU transmits other BBU.Each road business datum is transmitted between a source BBU and a purpose BBU, corresponding one main with sublink and a standby sublink, thereby realized the resource standby system that the BBU annular connects, the transmission link of every road business datum has been carried out the resource backup separately.
Below, the resource backup method to BBU annular cascade among the present invention is elaborated again.
Among the present invention, BBU can adopt different cuts detection methods, realizes the independent switching to each uplink business data and downlink service data transmission, thereby realizes the single resource backup of the resource standby system of BBU annular cascade to each road business datum.Below be two kinds of methods with the resource backup that realizes the cascade of BBU annular.
Method 1 is an example with the downlink service data that purpose BBU receives from other BBU; Method 2 is an example with the uplink business data that purpose BBU receives from other BBU.
Fig. 9 is the flow chart of the resource backup method 1 of BBU annular cascade among the present invention.As shown in Figure 9, be that RNC is an example with the net control device, the resource backup method of BBU annular cascade may further comprise the steps:
Step 901, the transmission unit of source BBU receives downlink service data from the RNC of system outside, and with downlink service data after the downlink processing unit carries out Base-Band Processing, send to the dilatation interface by the data allocations unit.
Step 902, source BBU is by two dilatation interfaces, and is promptly main with sublink and standby sublink through the transmission link of A direction and B direction, sends downlink service data to purpose BBU simultaneously.
Step 903～step 904, purpose BBU receives main with behind the downlink service data on sublink and the standby sublink by the dilatation interface, its data allocations unit is according to the destination address of business datum, judge that whether this downlink service data is is purpose BBU with this BBU, if then execution in step 906; If not, then execution in step 905.
Wherein, the data allocations unit of purpose BBU judges that by judging the dilatation interface that receives business datum it still is standby sublink with sublink independently that business datum is come.
Step 905, purpose BBU by the dilatation interface, is transmitted to this downlink service data other BBU in the system, and returns step 903, continues to receive business datum.
Step 906, the data allocations unit of purpose BBU sends the data to the change detection unit.
Step 907, whether change detection unit judges master is normal with the transmission state of sublink, if the main transmission state of sublink of using is normal, then execution in step 908; If main transmission state with sublink is unusual, then execution in step 909.
In this step, the change detection unit is to the main judgement of using the state of sublink, realize by the following method: the change detection unit carries out even parity check or CRC check to main downlink service data with sublink and standby sublink respectively earlier, again the mistake in the check results is added up, when the main mistake with the sublink check results that counts is less than or equal standby sublink check results wrong, judge that then main transmission state with sublink is normal; When the main mistake with the sublink check results that counts during, judge that then main transmission state with sublink is unusual more than standby sublink check results wrong.
Step 908, the change detection unit of purpose BBU generates invalid switch-over control signal according to testing result, and invalid switch-over control signal sent to the link switchover unit by main control unit, purpose BBU does not carry out active and standby switching to the transmission of this downlink business, the link switchover unit is according to invalid switch-over control signal, send to the RRU that with this BBU be connected with the downlink service data on the sublink by the base band radio frequency interface with main, and return step 903, continue to receive business datum.
Step 909, the change detection unit of purpose BBU generates effective switch-over control signal according to testing result, and with effective switch-over control signal, send to the link switchover unit by main control unit, the link switchover unit sends to the RRU that with this BBU be connected with the downlink service data on the standby sublink by the base band radio frequency interface according to effective switch-over control signal, and purpose BBU has realized active and standby switching, and return step 903, continue to receive business datum.
Purpose BBU can receive the business datum from multiple source BBU simultaneously, promptly receive simultaneously from a plurality of main business datums with sublink and standby sublink, therefore, in purpose BBU, to business datum, carry out above-mentioned flow process simultaneously from each source BBU.
This method is used for the resource backup of resource standby system when the transmission downlink service data of BBU annular cascade, also is applicable to the resource backup of resource standby system when the transmission uplink business data of BBU annular cascade.Source BBU and purpose BBU are respectively any one BBU on the annular link.
In this method, the process that step 907 judges whether to carry out active and standby switching for purpose BBU by detection, the method for detection are relatively more main transmission quality with sublink and standby sublink, also can be other detection methods; Step 908 is carried out the process of active and standby switching for purpose BBU, when switching to standby sublink, purpose BBU still receives the downlink service data of independently using sublink, and transmits other masters simultaneously with the business datum on the sublink, makes whole active link not be cut off; The RRU that is connected with this BBU also can be near-end RFU; According to the difference of mobile communication system type, downlink service data also can receive from the BSC of system outside.
More than be the explanation to method 1, in method 2, purpose BBU receives the uplink business data from other BBU, and uses predefined threshold value in change detection.
Figure 10 is the flow chart of the resource backup method 2 of BBU annular cascade among the present invention.As shown in figure 10, be that RNC is an example with the net control device, the resource backup method of BBU annular cascade may further comprise the steps:
Wherein, the data allocations unit of purpose BBU judges that by judging the dilatation interface that receives business datum it still is standby sublink with sublink independently that business datum is come.
The method of carrying out verification in this step is a CRC check, also can be other methods of calibration such as even parity check.
Purpose BBU can receive the business datum from multiple source BBU simultaneously, promptly receive simultaneously from a plurality of main business datums with sublink and standby sublink, therefore, in purpose BBU, to business datum, carry out above-mentioned flow process simultaneously from each source BBU.
This method is used for the resource backup of resource standby system when the transmission uplink business data of BBU annular cascade, also is applicable to the resource backup of resource standby system when the transmission downlink service data of BBU annular cascade.Source BBU and purpose BBU are respectively any one BBU on the annular link.
In this method, the process that step 1007～step 1010 judges whether to carry out active and standby switching for purpose BBU by detection, the method that detects is for judging main transmission quality with sublink and standby sublink by predefined threshold value, also can be other detection methods, be the replacement to the step 907 in the method 1; Step 1012 is carried out the process of active and standby switching for purpose BBU, when switching to standby sublink, purpose BBU still receives the uplink business data of independently using sublink, and transmits other masters simultaneously with the business datum on the sublink, makes whole active link not be cut off; The RRU that is connected with this BBU also can be near-end RFU; According to the difference of mobile communication system type, uplink business data also can send to the BSC of system outside.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1, the resource backup method of a kind of Base Band Unit BBU annular cascade is characterized in that, for the business datum from each source BBU in the system is provided with a main sublink and the standby sublink used, may further comprise the steps:
Each BBU in the resource standby system of A, BBU annular cascade is by the business datum of its dilatation interface reception from other BBU in the system;
B, BBU judge that whether the business datum receive is is purpose BBU with this BBU, if, execution in step C then;
C, to described main transmission quality with the business datum on sublink and the standby sublink, detect respectively, and judge whether that according to testing result needs switch, if desired, then carry out active and standby switching, to send to outside net control device by transmission unit from the business datum that standby sublink receives, perhaps send to external radio frequency unit R FU by the radio frequency interface unit.
2, the method for claim 1 is characterized in that, described step B further comprises: if the business datum that receives is not to be purpose BBU with this BBU, then transmits this business datum, and return steps A, continue to receive business datum.
3, the method for claim 1, it is characterized in that, described step C further comprises: do not switch if do not need, then will send to outside net control device by transmission unit, perhaps send to external RF U by the radio frequency interface unit from the main business datum that receives with sublink.
4, the method for claim 1 is characterized in that, further comprises after the described step C: return steps A, continue to receive business datum.
5, as any described method in the claim 1 to 4, it is characterized in that, describedly with sublink and a standby sublink be for a master being set from the business datum of each source BBU in the system:
Will be from clockwise or counter clockwise direction, from the business datum of source BBU, logically Dui Ying transmission link is set to the main sublink of using of described business datum; Will be with main opposite with the sublink direction, from the business datum of same source BBU, logically Dui Ying transmission link is set to standby sublink.
6, as any described method in the claim 1 to 4, it is characterized in that, whether the business datum that the described judgement of step B receives is to be that purpose BBU is with this BBU: described BBU is according to the destination address of business datum, judges that whether the business datum that receives is is purpose BBU with this BBU.
7, as any described method in the claim 1 to 4, it is characterized in that described step C is:
C1, described BBU are respectively to carrying out verification from the main business datum that receives with sublink and standby sublink;
C2, described BBU carry out error statistics to main with the check results of sublink and standby sublink respectively;
C3, described BBU will lead respectively with the error statistics result of sublink and standby sublink and predefined threshold value and compare, if main error statistics result with sublink has surpassed threshold value, it is unusual then to judge main transmission state with sublink, to send to outside net control device by transmission unit from the business datum that standby sublink receives, perhaps send to external RF U by the radio frequency interface unit.
8, method as claimed in claim 7 is characterized in that, step C1 is described to be verified as: carry out the cyclic redundancy check (CRC) verification, perhaps carry out even parity check.
9, the method for claim 1 is characterized in that, described net control device is a radio network controller, perhaps is base station controller.
10, a kind of Base Band Unit BBU, be arranged in annular cascaded system, comprise main control unit, transmission unit and baseband processing unit, it is characterized in that, the business datum of described Base Band Unit is provided with main with sublink and standby sublink, this Base Band Unit also comprises: the interface processing unit, comprise connecting described main two interfaces with sublink and standby sublink, and be used to receive business datum from external radio frequency unit R FU and outside BBU; To being that the transmission quality of the described main business datum with sublink and standby sublink of purpose BBU detects with this BBU, and, will send to transmission unit or outside RFU with sublink or from the business datum that standby sublink receives from described master according to testing result; With being not the business datum of purpose BBU, send to outside BBU with this BBU.
11, Base Band Unit as claimed in claim 10 is characterized in that, described interface is handled unit pack and drawn together: base band radio frequency interface, dilatation interface, data allocations unit, change detection unit and link switchover unit, wherein,
The base band radio frequency interface is used under the control of main control unit, will send to the external RF U that is connected with this BBU from the business datum of link switchover unit;
The dilatation interface comprises main two interfaces with sublink and standby sublink of connection, is used under the control of main control unit, receives main using on sublink and the standby sublink, from the business datum of outside BBU, and sends the data to the data allocations unit; To use sublink and standby sublink by the master from the business datum of data allocations unit, be transmitted to outside BBU;
The data allocations unit is used under the control of main control unit, receives the business datum from the dilatation interface, and according to the destination address of business datum, judges that whether described business datum is is purpose BBU with this BBU; With and be purpose BBU with this BBU, main with the business datum on sublink and the standby sublink, send to change detection unit and link switchover unit; Will be from the dilatation interface, and be not purpose BBU with this BBU, main with the business datum on sublink and the standby sublink, send to the dilatation interface;
The change detection unit is used under the control of main control unit, carries out change detection according to the business datum from the data allocations unit, and generates switch-over control signal according to testing result; Switch-over control signal is sent to main control unit;
The link switchover unit is used under the control of main control unit, receives from the data allocations unit, and is main with the data on sublink and the standby sublink; Reception when described switch-over control signal is invalid, sends to transmission unit or base band radio frequency interface with main with the business datum on the sublink from the switch-over control signal of main control unit; When described switch-over control signal is effective, the business datum on the standby sublink is sent to transmission unit or base band radio frequency interface;
Described main control unit is used for all unit of BBU are controlled; Reception is from the switch-over control signal of change detection unit, and described switch-over control signal is sent to the link switchover unit.
12, Base Band Unit as claimed in claim 11 is characterized in that, described base band radio frequency interface further receives the business datum from the external RF U that is connected with this BBU, and this business datum is sent to the data allocations unit;
Described data allocations unit further will send to baseband processing unit from the business datum of base band radio frequency interface; And receive from baseband processing unit, and be not the business datum of purpose BBU with this BBU, and these data are sent to the dilatation interface.
13, as claim 11 or 12 described Base Band Unit, it is characterized in that described baseband processing unit comprises: up processing unit and downlink processing unit, wherein
Up processing unit is used under the control of main control unit, will carry out Base-Band Processing from the uplink business data of data allocations unit, and after will handling, and is not that the uplink business data of purpose BBU sends to the data allocations unit with this BBU; To be that the uplink business data of purpose BBU sends to transmission unit with this BBU after handling;
The downlink processing unit is used under the control of main control unit, will carry out Base-Band Processing from the downlink service data of transmission unit, and the downlink service data after will handling sends to the data allocations unit;
Described data allocations unit further will be from the downlink processing unit, and is that the downlink service data of purpose BBU sends to the base band radio frequency interface with this BBU;
Described base band radio frequency interface further will send to the external RF U that is connected with this BBU from the downlink service data of data allocations unit.
14, as claim 11 or 12 described Base Band Unit, it is characterized in that, described change detection unit comprises: active link verification module and reserve link verification module, active link check results statistical module and reserve link check results statistical module, active link thresholding comparison module and reserve link thresholding comparison module and switching signal module, wherein
Active link verification module and reserve link verification module, be used for respectively carrying out verification, and check results is sent to active link check results statistical module and reserve link check results statistical module respectively from main data with sublink and the reception of standby sublink;
Active link check results statistical module and reserve link check results statistical module, be respectively applied for statistics from the mistake in the check results of active link verification module and reserve link verification module, and statistics is sent to active link thresholding comparison module and reserve link thresholding comparison module respectively;
Active link thresholding comparison module and reserve link thresholding comparison module, the statistics and the predefined threshold value that are respectively applied in the future independently with link check results statistical module and reserve link check results statistical module compare, and will send to the switching signal module greater than the result of thresholding with smaller or equal to the result of thresholding;
The switching signal module, be used for according to from active link thresholding comparison module greater than the thresholding result with from the result smaller or equal to thresholding of reserve link thresholding comparison module, produce effective switch-over control signal; According to from active link thresholding comparison module smaller or equal to the thresholding result, produce invalid switch-over control signal; Switch-over control signal is sent to the main control unit of BBU.
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| CN101771591B (en) * | 2008-12-26 | 2011-09-28 | 大唐移动通信设备有限公司 | Service transmission method and system under RRU and BBU loop network |
| CN101729348B (en) * | 2009-06-01 | 2011-12-28 | 中兴通讯股份有限公司 | Method and system for protecting point to multi-point ring |
| CN102655653B (en) * | 2011-03-02 | 2015-10-21 | 鼎桥通信技术有限公司 | TD-SCDMA base band link loop detection method and base station |
| CN102780599B (en) * | 2011-05-10 | 2015-04-01 | 上海中兴软件有限责任公司 | Ethernet data processing method of cascaded BBUs (Base Band Units) and BBUs of base station |
| EP2781065B1 (en) | 2011-11-16 | 2015-10-07 | Telefonaktiebolaget L M Ericsson (PUBL) | Technique for network routing |
| US9451500B2 (en) | 2011-11-16 | 2016-09-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Conditional routing technique |
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| CN106656336B (en) * | 2016-12-31 | 2019-06-25 | 南京泰通科技股份有限公司 | The active and standby signal processing method of LTE base station LTE Baseband Processing Unit |
| CN109787808A (en) * | 2019-04-03 | 2019-05-21 | 中国电子科技集团公司第二十八研究所 | A kind of multiple data centers adapting to wide-area deployment are anti-to ruin the method for taking over |
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